The North Icelandic Jet and its relationship to the North Icelandic Irminger Current
The North Icelandic Jet and its relationship to the North Icelandic Irminger Current
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DOI：
10.1357/002224017822109505
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发表时间：
2017-09-01
影响因子：
0.5
通讯作者：
Mastropole, Dana
中科院分区：
文献类型：
--
作者：
Pickart, Robert S.;Spall, Michael A.;Mastropole, Dana
船上水文和速度部分被用来量化方面的北冰岛射流（NIJ），它运输密集的溢流水到丹麦海峡，和北冰岛Irminger电流（NIIC），进口大西洋水到冰岛海。这两个电流的平均运输是可比的，在与以前的概念，有一个本地翻转单元在冰岛海，将大西洋水密集的溢流水。当NIJ和NIIC沿着冰岛的北侧流动时，当底部地形使它们靠近时，它们似乎共享一个共同的锋，但即使它们分开，NIJ的近岸也有一个向极流动。流入NIIC的盐度年际变化与流出NIJ的盐度年际变化一致。然而，有人建议，NIIC信号并不决定NIJ。相反，从格陵兰东部边界的液体和固体的淡水通量的组合可以解释所观察到的NIIC的NIJ的翻转环流在西北冰岛海的deningent一半的净淡化。这意味着剩余的倾覆必须发生在不同的地理区域，与早期的模型结果一致。NIJ盐度的年与年的变化可以通过将冰岛海蒸发量减去降水量的年度异常应用于一维混合模型来解释。这些异常变化的相位与风应力旋度在北大西洋副极地环流，以前的研究表明，驱动器的年际变化的盐度流入NIIC。
Shipboard hydrographic and velocity sections are used to quantify aspects of the North Icelandic Jet (NIJ), which transports dense overflow water to Denmark Strait, and the North Icelandic Irminger Current (NIIC), which imports Atlantic water to the Iceland Sea. The mean transports of the two currents are comparable, in line with previous notions that there is a local overturning cell in the Iceland Sea that transforms the Atlantic water to dense overflow water. As the NIJ and NIIC flow along the north side of Iceland, they appear to share a common front when the bottom topography steers them close together, but even when they are separate there is a poleward flow inshore of the NIJ. The interannual variability in salinity of the inflowing NIIC is in phase with that of the outflowing NIJ. It is suggested, however, that the NIIC signal does not dictate that of the NIJ. Instead, the combination of liquid and solid freshwater flux from the east Greenland boundary can account for the observed net freshening of the NIIC to the NIJ for the densest half of the overturning circulation in the northwest Iceland Sea. This implies that the remaining overturning must occur in a different geographic area, consistent with earlier model results. The year-to-year variability in salinity of the NIJ can be explained by applying annual anomalies of evaporation minus precipitation over the Iceland Sea to a one-dimensional mixing model. These anomalies vary in phase with the wind stress curl over the North Atlantic subpolar gyre, which previous studies have shown drives the interannual variation in salinity of the inflowing NIIC.